Return to Java Declared abstract, Java Abstract declaration, Abstract declaration, Abstract
“A class may be declared abstract (§8.1.1.1), and must be declared abstract if it is incompletely implemented; such a class cannot be instantiated, but can be extended by subclasses. The degree to which a class can be extended can be controlled explicitly (§8.1.1.2): it may be declared sealed to limit its subclasses, or it may be declared final to ensure no subclasses. Each class except Object is an extension of (that is, a subclass of) a single existing class (§8.1.4) and may implement interfaces (§8.1.5).” (JvLngSpc17 2021, Chapter 8 - Classes)
Classes in OOP: Class (computer programming), Abstract base class (ABC), Abstract class, Class body - Method body, Class browser, Class constructor (Canonical constructor, Compact canonical constructor, Normal canonical constructor, Constructor body, Default constructor, Explicit constructor invocation, Constructor modifier, Constructor overloading, Constructor signature - Method signature, Generic constructor, Constructor throw, Type of a constructor), Class declaration, Class definition, Enum class (Enum constant, Enum body declaration, Enum member), Class field (Field modifier, Static field, Transient field, Volatile field, Field initialization), Formal parameter, Class hiding (Method hiding by class methods), Class hierarchy, Class inheritance (Inheriting methods with Override-Equivalent signatures), Class initializer (Static initializer), Inner class, Class instance - Class instantiation (Class instance initializer - Preventing instantiation of a class), Class library, Class modifier, Final Class - Final method, Generic class (Generic Method - Type parameter), Class implementation file, Class invariant, Class member (Member class and interface declarations), Class methods (Method declaration, Method modifier, Native method, Method result, Method signature, synchronized method, Method throw), Nested class, Overloading (Class Overloading - Method Overloading, Constructor overloading), Overriding (Class overriding - Method overriding - Method overriding by instance methods - Method overriding by class methods, Requirements in overriding and hiding), Record class (Record components, Record constructor, Record constructor declaration, Record body declaration, Record member), Sealed class - Non-sealed class, Static method, strictfp class - strictfp method, Superclass and Subclass (Direct Subclass), Superinterface, C++ classes, C# classes, Java classes, JavaScript classes, Kotlin classes, Python classes, Ruby classes, Scala classes, TypeScript classes, Class topics. (navbar_classes – Don't confuse Course with Class here!)
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